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Details for Patent: 3,785,436

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Details for Patent: 3,785,436

Title: WELL PACKER
Abstract:A well packer adapted to be used for cementing operations and the like in a well, wherein the packer includes hold-down slips to hold the packer sealing means and packer slips in the set position, and such hold-down slips are actuated by fluid from the annulus so as to be isolated from the bore of the packer mandrel to keep the hold-down slips free of cement or other fluids in such bore which might cause a malfunctioning of the hold-down slips.
Inventor(s): Davis, Jr.; Philip E. (Houston, TX)
Assignee:
Filing Date:Jun 23, 1972
Application Number:05/265,655
Claims:1. A well packer for use in a well, comprising:

a mandrel having a central bore forming the central bore of the packer and adapted to be connected to a tubing string for lowering into a well pipe;

packer sealing means on said mandrel for sealing engagement with the pipe to seal off the annulus between the tubing string and the well pipe;

hold-down slips integrally connected with said mandrel for longitudinal movement together and with the tubing string at all times and for gripping engagement with the well pipe for preventing a premature release of said packer sealing means;

said mandrel having no passages therethrough above said sealing means;

fluid by-pass means with said mandrel for by-passing annulus fluid around said sealing means; and

valve means mounted on said mandrel for closing said fluid by-pass means above said sealing means after said packer sealing means is in sealing engagement with the well pipe.

2. The packer set forth in claim 1, including:

packer slip means on said mandrel;

a releasable J-slot connection means connecting said packer slip means to said mandrel and being releasable upon a rotation of said mandrel relative to said slip means; and

friction means engageable with the well pipe for preventing rotation of said slip means upon a rotation of said mandrel for releasing said J-slot connection means.

3. The packer set forth in claim 1, wherein said valve means includes an annular valve seal, and also including:

an annular valve sleeve mounted above said packer sealing means for communicating with said fluid by-pass means and having an inner bore of a diameter to receive said annular valve seal in sealing engagement therewith.

4. The packer set forth in claim 1, including:

packer slip means slidably mounted on said mandrel for supporting said mandrel in the well pipe; and

said hold-down slips having fluid passage means for communicating with said fluid by-pass means when said valve means has closed off said by-pass means above said sealing means for thereby directing the fluid from below said sealing means through said by-pass means to said hold-down slips for actuating same.

5. The packer set forth in claim 4, including:

means separating the bore of said mandrel and the tubing string from said hold-down slips for thereby isolating said hold-down slips from the fluid in said bore.

6. The packer set forth in claim 4, including:

support means for said valve means and said hold-down slips having connection with said mandrel for movement therewith to and from the position of said valve means wherein said by-pass means is closed off above said sealing means.

7. The packer set forth in claim 4, wherein:

said hold-down slips includes a plurality of gripping slips for engagement with the well pipe to prevent an inadvertent release of said sealing means and said packer slip means from their set positions in engagement with the well pipe; and

said fluid passage means includes a plurality of fluid passages from said by-pass means to said gripping slips for providing alternate flow routes for fluid to each of said gripping slips in the event one or more of the fluid passages becomes plugged.

8. A well packer for use in a well, comprising:

a mandrel having a central bore forming the central bore of the packer and adapted to be connected to a tubing string for lowering into a well pipe;

packer sealing means on said mandrel for sealing engagement with the pipe to seal off the annulus between the tubing and the well pipe;

hold-down slips mounted with said mandrel for longitudinal movement together and with the tubing string at all times and operable by fluid pressure from externally of the tubing string for gripping engagement with the well pipe;

means separating said hold-down slips from the bore of said mandrel and the tubing string; and

fluid passage means communicating said hold-down slips with fluid in the annulus between the tubing and the well pipe for actuating same after the sealing means have been set in engagement with the well pipe.

9. The packer set forth in claim 8, including:

packer slip means on said mandrel for gripping engagement with the well pipe for supporting said mandrel in the well.

10. The packer set forth in claim 8, including:

fluid by-pass means with said mandrel for by-passing fluid in the annulus around said sealing means; and

valve means mounted on said mandrel for closing said fluid by-pass means above said sealing means after said packer sealing means is in sealing engagement with the well pipe.

11. The packer set forth in claim 10, wherein:

said hold-down slips includes a plurality of gripping slips for engagement with the well pipe to prevent an inadvertent release of said sealing means and said packer slip means from their set positions in engagement with the well pipe; and

said fluid passage means includes a plurality of fluid passages from said by-pass means to said gripping slips for providing alternate flow routes for fluid to each of said gripping slips in the event one or more of the fluid passage becomes plugged.

12. The packer set forth in claim 10, wherein said valve means includes an annular valve seal, and also including:

an annular valve sleeve mounted above said packer sealing means for communicating with said fluid by-pass means and having an inner bore of a diameter to receive said annular valve seal in sealing engagement therewith.
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